Spark-arrester.



11. SCHMIDT SPARK ARRESTER. APPLIOATIO! FILED JULY 3,1907.

Patented July 26, 1910.

Fig

THE mmms PEfERS ca. wusnmcrou n c HANS SCHMIDT, OFIBERLIN, GERMANY.

SPARK-Annmarie.

Specification of Letters Patent. Patented July 26, 1910.

Application filed July 3, 1907. Serial No. 381,978.

To all whom it may concern:

Be it known that I, HANS SCHMI a subject of the Emperor of Germany,residing in Berlin, Germany, have invented certain new and usefulImprovements in Spark-Arresters, of which the following is aspecification.

My invention relates to that class of spark arresters in which invertedcones of reticulated material are arranged in a smoke stack in the pathof the products of combustion from a steam boiler or other furnace, andthe object of my invention is to so improve spark arr-esters of thisclass that the gases may be allowed to freely pass through the smokestack while the cinders and other solid particles of the products ofcombustion are arrested and returned to the chimney without clogging thesieves.

In carrying out my invention I preferably employ two cone-shaped sievesarranged one within the other and both arranged in a smoke stack orchimney "with their apexes pointing downward. The inner sieve ispreferably made of one continuous piece of wire cloth or other suitablereticulated material, while the outer sieve is divided to provide a freepassage for air out through the chimney and the return of solidparticles of combustion to the chimney, thus preventing the clogging ofthe sieve.

My improvements are clearly illustrated in the accompanying drawings inwhich,

Figure 1 shows a vertical section of a smoke stack with the conicalscreens indicated by dotted lines. Fig. 2 is a perspective view of thescreens. Fig. 3 shows a horizontal section on the line 33 of Fig. 1.

I have shown my invention embodied in a spark arrester wherein twoconical sieves are employed. A dilferent number might be used.

The inner sieve a is preferably made continuous, the tapered peripheryconsisting entirely or mainly of reticulated material, such as wirecloth as is usual. The upper portion of this conical sieve may besecured to the upper part of the smoke stack or chimney b in anysuitable way. As coneshaped sieves of this kind are quite common inspark arresters, no further description of this part of the invention isnecessary.

The outer sieve is of novel construction and accomplishes new results.As shown in the drawings, it is divided into two parts 0 and 03, eachconstituting a half cone, as

clearly indicated by dotted lines in Fig. 1. Each cone section is madeof reticulated material, such as wire cloth of preferably larger meshthan that of the cone a and one of these sections is preferably raisedabove the other as indicated and its vertical edges are made to overlap.the vertical edges on the other section. The parts of the divided conesnear these vertical edges are so held that they are out of contact witheach other and leave spaces or vertical slots which insure the passageof gases and the return of solid particles of combustioin As clearlyshown in Fig. 1 the outer cone is ar ranged around the lower portion ofthe inner cone and extends beyond the apex thereof. If the outer cone ismade continuous, there is danger of its lower portion be coming bankedup with cinders which would impede the passage of smoke and combustiongases, and it often happens in this class of spark arresters that themeshes of the cones become rusted or clogged so that a sufficient draftcannot be obtained.

By my iml )rovements the smoke and other gaseous pro nets of combustionare made to pass freely through the sieves in the normal operation ofthe apparatus, the larger cinders being arrested by the outer cone, as,owing to the overlapping of the cone sections, the cinders will strikethe reticulated parts of the cone and will thus be impeded. The smallercinders which may pass through the meshes are arrested by the inner coneand fall into the outer cone whence they are delivered through thevertical slots or openings between the cone sections. If, however, themeshes of the outer cone become rusted, clogged, or otherwise filled soas to impede the passage of the combustion gases, said gases will find aready passage through the openings between the cone sections abovereferred to.

I claim as my invention i 1. A spark-arrester, comprising an invertedcone of reticulated material and another cone of reticulated materialarranged around the lower portion of the first mentioned cone and whichis divided vertically, has overlapping vertical edges at the dividedportion to form an unrestricted opening extending from top to bottom ofsaid outer cone for the passage inwardly and upwardly of gases and thedelivery downward of solid particles, and which outer cone extends belowthe apex of the inner cone.

2. A spark arrester, comprising an inverted cone of reticulated materialand an outer cone of reticulated material surrounding the inner or uppercone and formed in sections, the vertical edges of which overlap withouttouching and thus provide openings for the passage inwardly and upwardlyof gases and the delivery downward of solid particles. V

3. The combination of a smoke stack, an

' inverted inner or upper cone of reticulated material arranged at theupper part thereof, and another cone of reticulated material arrangedaround the lower portion of that first mentioned which is divided andhas overlapping portions at the sides which are out of contact with eachother and thus provide a vertical opening for the purpose specified,

4:. The combination of a smoke stack, a

In witness whereof I have hereunto set my hand in presence of twowitnesses.

HANS SCHMIDT. Witnesses:

WOLDEMAR I-IAUr'r, HENRY HASPER.

